Fix Vagrant executable name

On Unix like systems the Vagrant executable should be vagrant instead of
vagrant.sh, although it is in fact a shell script.
Add Button to turn on cloud

Created new button to turn cloud (Vagrant managed VM) on and off.  Path
to vagrant server and worker is still hard coded, but will be corrected
later.

Added CloudMonitor class and made it accessible from PatApp.
Merge branch 'PAT-EC2' of https://github.com/NREL/OpenStudio into PAT-EC2